package com.yupi.yupicturebackend.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.ObjUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.yupi.yupicturebackend.constants.UserConstant;
import com.yupi.yupicturebackend.exception.BusinessException;
import com.yupi.yupicturebackend.exception.ErrorCode;
import com.yupi.yupicturebackend.model.dto.user.UserQueryRequest;
import com.yupi.yupicturebackend.model.entity.User;
import com.yupi.yupicturebackend.model.enums.UserRoleEnum;
import com.yupi.yupicturebackend.model.vo.LoginUserVO;
import com.yupi.yupicturebackend.model.vo.UserVO;
import com.yupi.yupicturebackend.service.UserService;
import com.yupi.yupicturebackend.mapper.UserMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import javax.servlet.http.HttpServletRequest;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;

/**
* @author Y9000
* @description 针对表【user(用户)】的数据库操作Service实现
* @createDate 2025-09-16 12:40:07
*/
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService{

    @Override
    public long userRegister(String userAccount, String userPassword, String checkPassword) {

        // 1. 校验参数
        if(StrUtil.hasBlank(userAccount, userPassword, checkPassword)){
            throw  new BusinessException(ErrorCode.PARAMS_ERROR,"参数为空");
        }
        if(userAccount.length() < 4){
            throw  new BusinessException(ErrorCode.PARAMS_ERROR,"用户账号过短");
        }
        if(userPassword.length() < 8 || checkPassword.length() < 8){
            throw  new BusinessException(ErrorCode.PARAMS_ERROR,"用户密码过短");
        }
        if(!userPassword.equals(checkPassword)){
            throw  new BusinessException(ErrorCode.PARAMS_ERROR,"两次输入的密码不一致");
        }

        //2. 校验是否与已有账号重复

        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount",userAccount);
        long count = this.baseMapper.selectCount(queryWrapper);
        if(count > 0){
            throw  new BusinessException(ErrorCode.PARAMS_ERROR,"账号重复");
        }


        //3 . 密码一定要加密

        String encryptePassword = getEncryptePassword(userPassword);


        //4. 插入数据到数据库中
        User user = new User();
        user.setUserAccount(userAccount);
        user.setUserPassword(encryptePassword);
        user.setUserName("无名");
        user.setUserRole(UserRoleEnum.USER.getValue());
        boolean saveResult =this.save( user);
        if(!saveResult){
            throw  new BusinessException(ErrorCode.SYSTEM_ERROR,"注册失败");
        }



        return user.getId();


    }

    @Override
    public LoginUserVO userLogin(String userAccount, String userPassword, HttpServletRequest request) {
        // 1. 校验参数
        if (StrUtil.hasBlank(userAccount, userPassword)){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"参数为空");
        }
        if (userAccount.length() < 4){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户账号过短");
        }
        if (userPassword.length() < 8){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户密码过短");
        }


        // 2。对用户传递的密码进行加密
        String encryptePassword = getEncryptePassword(userPassword);
        // 3.查询数据库是否存在
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount",userAccount);
        queryWrapper.eq("userPassword",encryptePassword);
        User user = this.baseMapper.selectOne(queryWrapper);
        //不存在，则抛异常
        if(user == null){
            log.info("用户不存在或密码错误");
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户不存在或密码错误");
        }

        //4，保存用户登录状态
        request.getSession().setAttribute(UserConstant.USER_LOGIN_STATE,user);

        return this.getLoginUserVO(user);
    }

    //获取脱敏后的用户信息
    @Override
    public LoginUserVO getLoginUserVO(User user) {

        LoginUserVO loginUserVO = new LoginUserVO();
        BeanUtil.copyProperties(user,loginUserVO);
        return loginUserVO;

    }

    //加密算法
    @Override
    public  String getEncryptePassword(String userPassword) {
        //加盐 混淆密码
        final  String SALT = "yupi";
        return DigestUtils.md5DigestAsHex((SALT+userPassword).getBytes());
    }

    @Override
    public User getLoginUser(HttpServletRequest request) {

        // 判断是否登录
        Object userObj = request.getSession().getAttribute(UserConstant.USER_LOGIN_STATE);
        User currentUser = (User) userObj;
        if(currentUser == null || currentUser.getId() == null){
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }

        Long userId = currentUser.getId();
        currentUser = this.getById(userId);
        if(currentUser == null){
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }

        return currentUser;
    }

    //获取脱敏后的用户信息
    @Override
    public UserVO getUserVO(User user) {

        if(user== null){
            return null;
        }
        UserVO userVO = new UserVO();
        BeanUtil.copyProperties(user,userVO);
        return userVO;
    }

    //获取脱敏后的用户信息集合
    @Override
    public List<UserVO> getUserVoList(List<User> userList) {
       if(CollUtil.isEmpty(userList)){
           return Collections.emptyList();
       }
       return userList
               .stream()
               .map(this::getUserVO)
               .collect(Collectors.toList());

    }

    //用户退出
    @Override
    public Boolean userLogout(HttpServletRequest request) {
        //判断是否已经登录
        Object userObj = request.getSession().getAttribute(UserConstant.USER_LOGIN_STATE);

        if(userObj==null){
            throw new BusinessException(ErrorCode.OPERATION_ERROR,"未登录");
        }
        //移除登录态
        request.getSession().removeAttribute(UserConstant.USER_LOGIN_STATE);

        return true;
    }

    // 获取查询条件
    @Override
    public QueryWrapper<User> getQueryWrapper(UserQueryRequest userQueryRequest) {
        if (userQueryRequest == null){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"请求参数为空");
        }
        Long id = userQueryRequest.getId();
        String userName = userQueryRequest.getUserName();
        String userAccount= userQueryRequest.getUserAccount();
        String userProfile = userQueryRequest.getUserProfile();
        String userRole = userQueryRequest.getUserRole();

        int current = userQueryRequest.getCurrent();
        int pageSize = userQueryRequest.getPageSize();
        String sortField = userQueryRequest.getSortField();
        String sortOrder = userQueryRequest.getSortOrder();

        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq(ObjUtil.isNotEmpty( id), "id", id);
        queryWrapper.eq(ObjUtil.isNotEmpty( userRole), "userRole", userRole);
        queryWrapper.like(ObjUtil.isNotEmpty( userName), "userName", userName);
        queryWrapper.like(ObjUtil.isNotEmpty( userAccount), "userAccount", userAccount);
        queryWrapper.like(ObjUtil.isNotEmpty( userProfile), "userProfile", userProfile);
        queryWrapper.orderBy(StrUtil.isNotBlank(sortField),sortOrder.equals("ascend"),sortField);


        return queryWrapper;
    }

    @Override
    public boolean isAdmin(User user) {


        return user != null && UserRoleEnum.ADMIN.getValue().equals(user.getUserRole());
    }
}




